110 entries under difficult topic. ×

18
multiple(adjective, hard, complex)
18
precarious(adjective, hard, complex)
18
sensitive(adjective, hard, delicate, complex)
18
severe(adjective, hard, complex, awkward)
18
sinuous(adjective, hard, complex)
18
toilsome(adjective, hard, complex, awkward)
18
trying(adjective, hard, complex, thorny)
14
convoluted(adjective, hard, simple, fancy, obscure)
14
entangled(verb, adjective, hard, fancy)
10
tortuous(adjective, obscure, complex, sophisticated)
8
abstruse(adjective, hard, fancy, obscure)
8
obscure(adjective, hard, complex, sophisticated)
8
perplexing(adjective, hard, fancy, obscure)
6
puzzling(adjective, hard, fancy, obscure)
5
recondite(adjective, hard, fancy, obscure)
4
baffling(adjective, hard, complex, awkward)
4
mixed(adjective, hard, fancy, obscure)
3
fancy(adjective, hard, complex, sophisticated)
2
mystifying(adjective, hard, awkward, tricky)
2
problematical(adjective, hard, delicate, loose)
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APASmart Define. (2015). involved thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/involved/thesaurus/synonyms
ChicagoSmart Define. 2015. "involved thesaurus" https://smartdefine.org/involved/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2015, involved thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/involved/thesaurus/synonyms>.
MLASmart Define. "involved thesaurus" 14 April 2015. Web. 22 September 2026. <https://smartdefine.org/involved/thesaurus/synonyms>